Amanda Seyfried is pregnant, expecting a child with fiancé Thomas Sadoski

PARIS, Nov. 30 (UPI) -- Actress Amanda Seyfried confirmed she and fiancé Thomas Sadoski are expecting their first child together after debuting her baby bump at a press event for Givenchy on Tuesday.

Seyfried showed off her growing belly in a sheer black dress at Givenchy's party, which she attended as the face of its new Live Irrésistable fragrance.

Seyfried, who is best known for her role as dim-witted Karen in Mean Girls, and Sadoski announced their engagement in September. They first met on the set of the off-Broadway production The Way We Get By last year.